Pistol grip pump-type dispenser



May 23, 1967 G. JELLINEK 3,321,111

PISTOL GRIP PUMP-TYPE DISPENSER Filed Dec. 28, 1965 5 Sheets-Sheet l May 23, 1967 G. JELLlNEK 3,321,111

PISTOL GRIP PUMP-TYPE DISPENSER THEIR.-

May 23, 1967 G. JELLINEK PISTOL GRIP PUMPTYPE DISPENSER Filed Deo. 28, 1965 5 Sheets-Sheet ATTO EY United States Patent O 3,321,111 PISTOL GRIP PUMP-TYPE DISPENSER George Jellinek, Plainfield, NJ., assignor to Merck & Co., Ine., Railway, NJ., a corporation of New Jersey Filed Dec. 28, 1965, Ser. No. 516,933 4 Claims. (Cl. 222-321) This invention relates to a manually operated pumptype dispenser for a liquid contained within a container.

The object of this invention is to lprovide such a dispenser:

(a) that has the container in the form of a bottle; v

(b) that has the bottle and the actuating mechanism grasped by the hand in a pistol-like grip;

(c) that is actuated by squeezing the irst nger of the hand, similarly as when squeezing the trigger of a pistol;

(d) that is simple in construction so that it can be -made inexpensively of synthetic plastic material;

(e) that is not diliicult to operate and does not tend to jam when operated;

`() that is easy to aim at a single point, and will direct to that point all the material ejected by one squeeze of the actuating mechanism;

(g) that will discharge a uniform quantity of liquid with each squeeze of the actuating mechanism, within a small tolerance range, and

(h) that will operate satisfactorily with a liquid containing in appreciable amount of a solid suspended therein, even after a substantial amount of time elapses between one series of uses and a second series of uses.

Other objects, and the features of the invention, will become apparent as the description proceeds.

In the drawings:

FIGURE 1 is an elevational view of the dispenser, looking endwise at its discharge element and linger piece;

FIGURE 2 is a sectional view of the dispenser and container taken along the line 2--2 of FIGURE 1;

FIGURE 3 is an elevational view of the valve disc at the intake end of the pump of the dispenser;

FIGURE 4 is a sectional View of the dispenser taken along the line 4 4 of FIGURE 2;

FIGURE 5 is a sectional view of the dispenser taken along the line 5-5 of FIGURE 2;

FIGURE 6 is an exploded view of the discharge element, finger piece, washer, piston and associated parts of the dispenser;

FIGURE 7 is a view similar to FIGURE 1 with the linger piece fully depressed and rotated 90 to lock the parts in the position shown;

FIGURE S is a sectional view taken along the line 8-8 of FIGURE 7, showing the parts in the position conforming to that shown in FIGURE 7;

FIGURE 9 is a substantially vertical section of the intake end of the pump with a modified type of intake valve thereat, the section being taken along the line 9--9 of FIGURE l0;

FIGURE l0 is a view of one part of such modified intake valve shown in FIGURE 9;

FIGURE 1l is an exploded View of the modified intake valve shown in FIGURES 9 and 10;

FIGURE l2 is a view similar to FIGURE l showing a modified form of the finger piece and discharge element; and

FIGURE 13 is a View similar to FIGURE Z, taken along the lines 13-13 of FIGURE 12.

Referring to the embodiment of theiinvention sho-wn in FIGURES 1-8, the liquid to be dispensed is contained within the container generally indicated by the reference number 21. This container is in the form of a cylindrical Mice bottle having a wide mouth opening 22 at the Upper end of the container neck 23 (see FIGURE 2). rThe container 21 is conveniently formed of a suitable synthetic plastic which is compatible with the liquid and the ingredients dissolved or suspended therein. The longitudinal axis of this cylindrical container 21 is indicated in FIG- URES l and 2 by the dot-and-dash line A-A. The neck 23 of the container has screw threads 24 formed therein (see FIGURE 2).

A cap 31 is fastened to the top of the container 2-1 by being screwed onto the threads 24, and thus serves as the closure for the container. In addition, this cap 31 also serves as the Ibase and support for the dispenser, generally indicated by the reference number 35.

This dispenser 35 consists of a pump generally indicated by the reference number 41, a linger piece generally indicated by the reference number 71, a discharge element generally indicated by the reference number S1, and an intake element generally designated by the reference number 91.

The pump 41 is of the reciprocating type, having a chamber 42 with a cylindrical bore 43. In this bore a piston 44, closely fitting the bore 43, moves in the direction of the longitudinal axis of the bore, this axis being indicated in FIGURE 2 by the dot-and-dash line B-B and being indicated in FIGURE 1 by the dot B. The piston 44 is secured to a piston rod 45 which is hollow and thus has a =bore 46, the axis of this piston rod coinciding with the longitudinal axis B-B of the bore of the piston chamber. This axis B-B is at right angles to the axis A-A of the container 21. One end of the -pump chamber 42 is open as the chamber is constructed, hut closed by a closure ring 46, through the center of which the piston rod 45 passes.

Positioned across the extending end of piston rod 45, and secured thereto, is the nger piece 71. This has a finger pressure area 72, preferably with an arcuate surface, in the form of part of the wall of an imaginary cylinder whose `axis is in the same horizontal plane as the `axis B-B of the piston rod 45 but at right angles to that axis. Hence, when the container 21 is grasped by the hand about its cylindrical wall, the end of the first finger of the hand is readily and comfortably positioned against the finger pressure area 72, in pistol grip fashion. By pressing the first finger inward, the finger piece 71 is thus moved inwardly toward the pump chamber 42, and this movement carries with it the piston rod 45 and the piston 44. Preferably the center `of linger pressure on finger piece 71 is directly in line with the axis B-B of the piston rod 45 and pump chamber 42, as shown in FIG- URES l, 2 and 6 of the drawings.

Finger piece 71 has a bore 73 behind it that connects at one end with the bore 46 of the piston rod 45, and connects at the lother end with the bore S2 `of the discharge element 81.

The axis of the bore 82 of the discharge element 81 is indicated by the dot-and-dash line C-C `in FIGURES 2 and 6, (and by the dot C in FIGURE l), and is parallel to, and positioned above the axis B-B. The exit end of bore 82 is illustrated as a nozzle 83. This directs the discharged liquid, as a spurt of liquid, in the direction of axis C-C. This direction, as previously stated, is parallel to the axis B-B of the pump chamber 42 and piston rod 45. Hence, when the container is held stationary `and the pump 41 is operated by pressing the finger piece 71 inwardly to effect the discharge of liquid by the dispenser 35, all of the discharged spurt of liquid is aimed at one point or at a small circular area centralized about a single point.

The following are additional details of the construction and operation of this dispenser.

The exterior of the pump chamber 42 has a flat bottom surface 48 which engages, and is adhesively secured, to the top surface of cap 31. Surface 48 also has two downwardly projecting lugs 49 and 51 that fit into suitable holes in the cap 31. `Lug 49 has a bore 50 therein that communicates with the fioor of bore 43 of the pump chamber 42 near the closure ring 47. Bore 50 serves as a drain for the return to the container of any liquid that may leak past the piston 44. It also serves to vent air into the container 21 to replace the liquid discharged, this air having passed the closure ring 47 in a manner to be described shortly.

Lug 51 has a borev 92 therein that is part of the pump intake element 91. Into this bore 92 fits the top of a dip tube 93, the lower end of this dip t-ube extending to the bottom of the container 21. Bore 92 communicates with the lower end of passage 94. The upper end of passage 94 opens into the vertical end wall 52 of the bore 43 of pump chamber 42.

Across the opening of passage 94 to end wall 52 is positioned a vertical disc 95 that opens and closes this opening, and thus serves as an intake valve for the pump 41. In the construction shown, the disc 95 is held against the vertical end wall 52 by the pressure of one end of coiled spring 53 around the periphery of disc 95. The other end of spring 53 bears against the piston 44, as will be described shortly. The valve disc 95, shown by itself in FIGURE 3, has a cut 96 around a major part of its periphery, at a radius shorter than the inner radius of the coil of spring 53 bearing against the valve disc 95. This produces an area 97 of disc 95 that is hingedly connected at 98 to the outer ring 99 of disc 95, the movable area 97 moving inwardly, as a result of the suction created in the bore 43 of the pump 41, when the pump piston 44 is moved to the left (as shown in FIGURE 2). When the pump piston 44 is moved to the right, the movable area 97 of the valve disc 95 moves to the right (as shown in FIGURE `2), against the end wall `52 and so closes the opening to passage 94.

The piston 44 of the pump 41 is preferably made of a suitable synthetic plastic having suficient resiliency that the outer end of a rearwardly extending conical flange 54 bears against the cylindrical bore 43 of the pump chamber 42 to effect a seal around the periphery of the piston. The piston has in addition a radially extending rib 55 which also bears against the bore 43 and serves as a guide for the piston. The piston 44 has a forwardly extending collar 56 that fits snugly about the end of piston rod 45, the rod having a small, outwardly extending rib 57 that fits into a corresponding recess in the interior of the collar to assist in securing the piston 44 upon the piston rod 415.

The center of the piston 44 is hollow and formed with a conical shoulder 58 against which seats a ball 59 which is urged against the shoulder by a spring 60. The other end of spring 60 extends into the bore 46 of the piston rod 46 and bears against a shoulder 61 in that bore. Ball 59 and its seat 58 thus serve as the outlet valve for pump 41.

The piston 44 has a radial shoulder 62 surrounding the hollow bore of the piston 55 where this bore communicates with the pumping Varea of the pump 41. Against this shoulder 62 abuts the forward end of spring 531.

The closure ring 47 has a rearwardly extending flange 63 that fits snugly over the forward end of pump chamber 42, the pump chamber having a small, outwardly extending rib 64 that `fits into .a corresponding recess in the underside of the flange 63 to assist in securing the closure ring 47 upon the pump chamber. The closure ring 47 also has a rearwardly extending cylindrical portion 65 that fits inside the bore 43 of cylinder 42. The piston rod 45 passes through the central bore 66 of this cylindrical portion 65.

Piston rod 45 has two radially extending studs 67 that -move through longitudinal slots 68 in the closure ring 47 as the piston rod is reciprocated. The studs 67 tit loosely in these slots 68, so that air can pass from the exterior of the pump chamber 42 through these slots 68 into the inside of the pump chamber in the region forwardly of the piston 44 (i.e., the region to the left of the piston 44, as shown in FIGURE 2). From this region the air can pass through bore 50 into the container 21, to replace the liquid -discharged from the container.

The studs 68 move past the inner radial wall 69 of the cylindrical portion `65 of the closure ring 47 when the piston rod 45 is in fully depressed position (as shown in FIGURE 8). Hence, when the piston rod 45, and its attached finger piece 71, is rotated one quarter turn (as shown in FIGURES 7 and 8), the studs 68 lock behind the wall 69 and maintain the piston rod 45 and finger piece 71 in that position. In this position a circular rib 70 on the forward face of closure ring 47 engages a radial surface 74 at the rear of finger piece 71 to effect a seal thereat. Thus, in this position, the container 21 and its dispenser 35 can be shipped without any of the liquid in the container leaking out of the container. This is for the reason that the seal at surface 74 and rib 70 prevents the escape of any liquid that might leak out the passageways provided for venting air into the container during use of the dispenser.

To operate `t-he dispenser, and assuming that initially it is in the locked-depressed position shown in FIGURES 7 and 8, the finger piece 71 is rotated one quarter turn clockwise, as viewed in FIGURE 7, to its position as shown in FIGURE l. In that position the studs 67 no longer are locked behind the closure wall 69, but are in alignment with the slots `68 in the closure 47. The spring 53 thus moves the piston 44 forwardly (i.e., to the left, as shown in FIGURES 2 and 8) creating a reduced pressure in the area of the pump chamber 42 rearwardly of the piston. This reduced pressure causes the movable area 97 of valve disc 95 to move inwardly, and also causes the liquid in the container 21 to move upwardly through the dip 4tube 93 and intake passage 94, past the intake valve disc 95, into the bore 43 of the pump chamber 42.

When the piston is moved by spring 53V to the point where collar 56 of the piston 44 engages the closure Wall 69, the piston 44 can move no further in the forward direction, and this constitutes the extended position of the parts, as shown in FIGURE 2.

In this position the liquid in the bore 43 of the pump chamber 42 to the right of the piston 44 (as viewed in FIGURE 2), tends to maintain the movable area 97 of the intake valve disc against the vertical end wall 52 of the bore 43, and thereby impede the flow of liquid back into the container.

The user now grasps the upper portion of container 21 in the palm of his hand, with his first finger engaging the finger pressure area 72 of the finger piece 71 directly in line with the axis B-B of the piston rod 45 and of the piston 44.

When the user squeezes or pulls Iin with his first finger, in a manner similar to squeezing or pulling the trigger of a pistol, the finger piece 71 is moved inwardly (i.e., to the right as viewed in FIGURE 2) and with it is moved piston rod 45 and piston 44. The liquid in the bore 43 of pump chamber 42 to the right of the piston 44 is thereby put under pressure.

The movable area 97 of the intake valve disc 95 is thereby further pressed against the vertical end wall 52 of the bore 43 of pump chamber 42 to prevent the fiow of liquid back into the container.

The pressure to which the liquid in the bore 43 of pump chamber 42 to the right of piston 44 is subjected, when finge-r pressure is applied to the finger piece 71, causes the ball `59 to unseat from the shoulder 57 (against which it is normally urged by spring 60), and permit the liquid, under pressure, to escape from the pump chamber into the bore 46 of the piston rod 45 and move through the bore 73 of the iinger piece 71 to the bore 82 of the discharge element 81. The liquid is then discharged through the nozzle 83 of the discharge element, in the direction of axis C-C, which is parallel to, but displaced above, the axis B--B of the piston rod.

It is to be noted that while the user holds the container V21 in a fixed position during the discharge of liquid from the container, the liquid discharged from the nozzle 83 is directed at one point or at a small circular area centralized about a single point.

It is also to be noted that the finger pressure applied to eiiect discharge of the liquid is applied directly along the axis of movement of the piston rod, so that there is no tendency to distort the various parts of the pump, or to cause any binding between any of its parts, or to unduly stress any of its plastic parts, during its discharge cycle of operation. In particular, the surfaces of piston 44 engaging the bore 43 of the pump chamber 42 are not subjected to pressures which a-re unequal `about the periphery of the piston.

The end result is .a dispenser which is simple in construction and can be made from synthetic plastics, except for the two springs 53 and 60 and the single ball 59.

Various modifications can be made to parts of the dispenser without departing from the principle of the invention.

Examples of such modiiications are shown in FIG- URES 9-13, inclusive. To simplify the description of these modiiications, parts therein corresponding exactly to parts described in connect-ion with FIGURES 1-8 are identically numbered; and parts therein corresponding, with some modification, to parts described in connection with FIGURES 1-8 are numbered with reference nurnbers one hundred higher than those used for the corresponding parts in FIGURES 1-8.

As one example of a modiiication, the intake valve may be made as shown in FIGURES 9, 10 and ll. The plastic valve disc 195, corresponding in basic function to the plastic vertical disc 95 of FIGURES 1-8, is an uncut disc, held vertically over the upper end of intake passage 94 by a retaining ring 101 interposed between spring 53 and the vertical end wall 52 of bore 43. The retaining Vring 101 has a cylindrical recess 102 into which the valve disc 195 `fits loosely, the axial depth of the recess being larger than the thickness of the disc 195 so that the disc 195 may move away from the end wall 52 and uncover the open- Iing to the `upper end of the intake passage 94.

In addition, the retaining ring 101 has multiple openings, suc-h as the center hole 103, the peripheral holes 104, and the radial slots 105 connecting the center hole 103 with the peripheral holes 104, through `which the liquid that passes between the valve disc 195 and the end wall 52 in the intake portion of a cycle of operation of the dispenser, may readily pass through the retaining ring 101 into the bore 43 of the pump chamber 42.

As another example of a modification, FIGURES l2 and 13 illustrate a modification made to the discharge element 81, the iinger piece 71, and the piston rod 45 of the dispenser shown in FIGURES 1-8. In making those parts in the form shown in FIGURES l-8, the discharge element 81, finger piece 71 and piston rod 45 are conveniently molded as two halves of a single molded part, the dividing plane for the two halves being a vertical plane through the axes B-B and C-C. The two separately molded halves are then secured together by adhesive or other suitable means.

In the modied construction shown in FIGURES 12 and 13, the piston rod 145 and iinger piece 171 are molded as a complete single part, and the discharge element 181 is molded as a separate, complete single part having a downwardly extending hollow tube portion 184 at its rear, iitting into an annular shoulder 17 S formed at the upper end of a vertically extending hollow tube portion 176 positioned behind the iinger pressure area 172 of iinger piece 171, and integral therewith. The bore 146 of piston rod 14S communicates with the bore 173 of the finger piece 171 (which is the inside of tube portion 176). The bore 182 of the discharge element 181 communicates with the bore of the tube portion 134. Hence, when the discharge element 181 is secured to the back of linger piece 171 by iitting the lower end of tube portion 184 int-o the shoulder 175, there is a passageway for the flow of liquid from the bore 43 of pump -chamber 42, past the ball valve 59 into the bore 146 of the piston 145, through the 'bore 173 of finger piece 171, through the bores 185 and 182 of discharge element 181, and out the nozzle 183.

In this modification the upper part of the iinger pressure area 172 extends in wings 177 above the axis of the bore 182 of the discharge element 181 on either side of that element, so that these wings protect the discharge element 181 against extraneous lateral forces against it.

The dispenser of this invention is a simple and useful device for administering a uniform dose of a medicament into the mouth of a small animal, such as a piglet, which is held against the body by one arm and hand while the :other hand is used to operate the dispenser and aim the discharge of liquid into the animals mouth. When so used, the length of bore 82 is preferably about two inches, so that it can be inserted in the animals mouth to deposit the medicament on the back of the animals tongue. During such administration of the medicament into the mouth of the animal, the container 21 is held `in one position throughout. This makes for ease of administration, uniformity of dose, and no leakage `of the liquid from the sides of the animals mouth.

The dispenser of this invention will 'dispense not only watery liquids, but also is capable, even though made of synthetic plastic material, to dispense uniform dos-es, of the order of 1.25 cc. each, or liquids which contain a substantial amount of solids suspended in an oily vehicle, such as corn oil, and so have an appreciable viscosity, such as of the order tot 900 centipoise (as measured by a Brookfield Model LVT viscosimeter, using a number 2 spindle at 12 r.p.rn.).

I claim:

1. In a manually-operated pistol-grip, pump-type :dispenser for dispensing liquid from a substantially cylindrical, open-top container, the pump (a) being aiixed to and positioned just above a closure for the container, (b) having a cylindrical pump chamber, the axis of which is substantially at `right angles to the longitudinal axis of the container., (c) having a cylindrical piston within the pump chamber `and (d) having a tubular reciprocating piston rod at the axis of the purnp chamber and piston through which the liquid being pumped from the oontainer iiows to the discharge nozzle when the piston rod, and the piston connected thereto, are manually move-d from their extended, forward position (to which they are biased by a spring) to their depressed, operated, rearward position, the pump (e) `also having a discharge valve within the ypiston for releasing the liquid in the chamber of the pump into the bore of the piston rod when the rod and piston are moved from their extended, forward position to their depressed, operated, rearward position, and (f) having an intake valve controlling the flow of liquid between a dip tube extending down into the container and the pump cylinder, and with the dispenser having a member (i) secured to the piston rod externally of the pump cylinder, (ii) with one part of such member serving as a discharge nozzle and having its axis of discharge oriented substantially parallel to the longitudinal axis of the pump chamber and piston rod but displaced yabove such axis when the dispenser is in condition for operation, (iii) with another part of su-ch member serving as a iinger pressure area so that pressure upon such area moves the piston from its extended, state-ofrest, forward position to its depressed, operated, rearward position and (iv) with a passageway connecting the piston rod with the discharge nozzle so that liquid flows from the exterior end yof the piston `rod up to the discharge nozzle when the piston is moved from its extended, state-of-rest, forward position to its depressed, operated rearward position, the improvement in said dispenser in which:

(A) the chamber in which the pump piston reciprocates is closed by a closure ring through which the piston rod passes and extends forwardly therefrom;

(B) the piston rod has at least one lug extending radially beyond the exterior surface of the rod, the position of the lug axially on the piston rod being such that it is just inside an adjacent inner wall of the closure ring when the piston rod and piston are in their depressed, operated, rearward position; and

(C) the closure ring has a longitudinal slot for each such lug, each lug moving in its corresponding slot when the piston rod and piston reciprocate between their extended, forward position and their depressed, operated, -rearward position;

whereby, when the piston rod and piston are in their depressed, operated, rearward position, they may be rotated about their longitudinal axis, by rotating the member having the finger pressure area, to position each lug behind a part of the adjacent inner wall of the closure, ring that has no slot therein, and thereby lock the piston rod and piston in their depressed, operated, rearward position.

2. A dispenser as set forth in claim 1 in which the thickness of the closure ring, in its central area through which the piston rod passes, is sufficiently thick that the radial lug or lugs on the piston rod, when the piston rod is moved to its extended, forward position, are still within their corresponding slots in the closure ring, so that the piston .rod cannot be rotated when it is `in its extended, forward position.

3. A dispenser as set forth in claim 2 in which:

(a) there is a passageway to the lcontainer from the chamber in which the pump piston reciprocates, the

passageway connecting with such chamber forwardly of the position of the piston when in its extended, forward position, so that any liquid that leaks forward past the piston is returned to the container; and

(b) the slots in the closure ring extend completely through the closure ring, and the t of the radial lugs in these slots is loose, so that these slots, together with the liquid returning passageway, serve to vent air into the container to replace the liquid discharged therefrom.

4. A dispenser as set forth in claim 3 in which:

(a) the exterior wall of the closure ring perpendicular to the axis of the piston `rod is provided with a circular rib of uniform height centered about the axis of the piston rod; and

(b) the rear of the member having the linger pressure area has a surface centered about the axis of the piston rod that engages the circular rib when the piston rod is in its depressed, operated, rearward position, and continues in engagement With the rib when such member and piston rod are rotated to lock the piston rod in its depressed, operated, rearward position, the rib and rear surface of such member thereby serving, While the dispenser is so locked, to effect a seal to prevent the escape of liquid from the container through the air venting passageways.

References Cited by the Examiner UNITED STATES PATENTS 1,410,878 3/1932 Benshoof 222-385 X 2,004,275 6/1935 Rothchild et al. 222-321 2,753,079 7/1956 Hersey 222-382 X 2,753,578 7/1956 Lebet 222-383 X 3,179,306 4/1965 Corsette 222-384 X ROBERT B. REEVES, Primary Examiner.

N. L. STACK, Assistant Examiner. 

1. IN A MANUALLY-OPERATED PISTOL-GRIP, PUMP-TYPE DISPENSER FOR DISPENSING LIQUID FROM A SUBSTANTIALLY CYLINDRICAL, OPEN-TOP CONTAINER, THE PUMP (A) BEING AFFIXED TO AND POSITIONED JUST ABOVE A CLOSURE FOR THE CONTAINER, (B) HAVING A CYLINDRICAL PUMP CHAMBER, THE AXIS OF WHICH IS SUBSTANTIALLY AT RIGHT ANGLES TO THE LONGITUDINAL AXIS OF THE CONTAINER, (C) HAVING A CYLINDRICAL PISTON WITHIN THE PUMP CHAMBER AND (D) HAVING A TUBULAR RECIPROCATING PISTON ROD AT THE AXIS OF THE PUMP CHAMBER AND PISTON THROUGH WHICH THE LIQUID BEING PUMPED FROM THE CONTAINER FLOWS TO THE DISCHARGE NOZZLE WHEN THE PISTON ROD, AND THE PISTON CONNECTED THERETO, ARE MANUALLY MOVED FROM THEIR EXTENDED, FORWARD POSITION (TO WHICH THEY ARE BIASED BY A SPRING) TO THEIR DEPRESSED, OPERATED, REARWARD POSITION, THE PUMP (E) ALSO HAVING A DISCHARGE VALVE WITHIN THE PISTON FOR RELEASING THE LIQUID IN THE CHAMBER OF THE PUMP INTO THE BORE OF THE PISTON ROD WHEN THE ROD AND PISTON ARE MOVED FROM THEIR EXTENDED, FORWARD POSITION TO THEIR DEPRESSED, OPERATED, REARWARD POSITION, AND (F) HAVING AN INTAKE VALVE CONTROLLING THE FLOW OF LIQUID BETWEEN A DIP TUBE EXTENDING DOWN INTO THE CONTAINER AND THE PUMP CYLINDER, AND WITH THE DISPENSER HAVING A MEMBER (I) SECURED TO THE PISTON ROD EXTERNALLY OF THE PUMP CYLINDER, (II) WITH ONE PART OF SUCH MEMBER SERVING AS A DISCHARGE NOZZLE AND HAVING ITS AXIS OF DISCHARGE ORIENTED SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF THE PUMP CHAMBER AND PISTON ROD BUT DISPLACED ABOVE SUCH AXIS WHEN THE DISPENSER IS IN CONDITION FOR OPERATION, (III) WITH ANOTHER PART OF SUCH MEMBER SERVING AS A FINGER PRESSURE AREA SO THAT PRESSURE UPON SUCH AREA MOVES THE PISTON FROM ITS EXTENDED, STATE-OF- 